Why cant FWD drive faster then a RWD car?

Answer 1

One of the reasons is that FWD's cant have as much power as a RWD.

on FWD cars, the front wheels have to the steering, braking and transfering all the power to the road. When the power output reaches around 200-250BHP, you get tourqe steer, where the car steers its self as all the power makes the wheels turn on way or another. ESP can help.

FWD's are known for UNDERsteering. This is where the front of the car pushes away from the corner while taking one. More power = More Understeer. Also having a heavy engine i.e V6/V8 can make this worse.

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RWD cars have the power at the back, meaning the front wheels only have to steer and brake. What limits a RWD is again power. After around 450/500 BHP, you tend to get wheelspin, but this can be controlled by the drivers foot or TCS/ESP.

RWD's OVERsteer. This is when the rear of the car pushes away from the corner. This can be controlled by turning away from the corner while the back is out. Again letting off the throttle or having ESP/TCS on can help.

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Summary:

RWD can take more power. Usually meaning faster. But a light 200hp FWD can be faster than a heavy 300hp RWD car